Java Double Number Parse toDouble(final Object o, final String pattern)

Description

to Double

License

Apache License

Declaration

public static Double toDouble(final Object o, final String pattern) 

Method Source Code

//package com.java2s;
/*/*w ww . ja  va  2s  .  c  o  m*/
 * Copyright 2004-2012 the Seasar Foundation and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

import java.text.SimpleDateFormat;

public class Main {

    public static Double toDouble(final Object o) {
        return toDouble(o, null);
    }

    public static Double toDouble(final Object o, final String pattern) {
        if (o == null) {
            return null;
        } else if (o instanceof Double) {
            return (Double) o;
        } else if (o instanceof Number) {
            return new Double(((Number) o).doubleValue());
        } else if (o instanceof String) {
            return toDouble((String) o);
        } else if (o instanceof java.util.Date) {
            if (pattern != null) {
                return new Double(new SimpleDateFormat(pattern).format(o));
            }
            return new Double(((java.util.Date) o).getTime());
        } else {
            return toDouble(o.toString());
        }
    }

    private static Double toDouble(final String s) {
        if (s == null || s.isEmpty()) {
            return null;
        }
        return new Double(s);
    }
}

Related

1. toDouble(Locale locale, String value)
2. tryParseDoubleValue(String s, double[] result)